Experimental Study On The Treatment Of Campus Sewage By Anoxic/Aerobic BCO Process

Traditional aerobic biological contact oxidation process with high organic matter removal efficiency, adaptability, stable operation and manage easy. In this study, according to the Xinjiang region sewage water features, the use of anoxic/aerobic biological contact oxidation process of sewage campus life. The process for the buried-one device is a front in the traditional biological contact oxidation means adding a trace amount of aeration anoxic tank unit, consisting of new anoxic/aerobic biological contact oxidation combined process by hypoxia equipment and aerobic equipment decontamination combine to make the process better able to adapt to the arid zone water reuse emission requirements, to achieve superior stain removal. The device is located in the north gate of Xinjiang Agricultural University Experiment Station sewage treatment. The main contents are:to start the process of biofilm processes run factors, experimental study indicators multi-parameter optimum operating parameters, impact load capacity and low operating results and more. Research indicates:(1) This reactor started up with granular sludge inoculation. Successfully started-up in 17 days, the reactor had the removal ratio more than 85.76% in COD,77.12% in ammonium and 89.16% in SS separately. The effluent concentrations of COD, ammonium and SS were 59.32mg/L? 12.08mg/L and 14.6mg/L. At this time the reactor was attached with tan biofilm.(2) After the univariate analysis of hydraulic rentention time and reflux ratio which can affect the wastewater treatment efficiency, the result showed that with hydraulic rentention time of 8h and reflux ratio of 200%, the reactor had a more optimized operating condition.(3) Under the optimized condition, the average removal ratio of COD, NH4+-N, and SS are 92.68%, 87.19% and 95.03% separately with the effluent flow is 90-120m3/d. The effluent concentrations of COD, ammonium and SS were 31.29mg/L,5.4mg/L and 7.62mg/L.The outflow quality was steady and reached level IB standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant.(4) During the operation, the system encountered water quality fluctuation and operated normally. The average removal efficiency of COD, NH4+-N, and SS are 91.34%,84.82% and 94.06%, respectively. This indicates that this system has good impact resistance.(5) The temperature has a great effect on the nitrogen removal in the combined process, especially for NH4+-N. The average removal rate of COD, NH4-N, SS decreased to 86.88%,79.20% and 89.43%, respectively. The benzene board in buried integration equipment was set up to keep normal operation in the process under low temperature. The temperature of the reactor at low temperature was maintained at 12-16?. The effluent COD, NH4+-N and SS still can achieve a stable discharge standards for sewage treatment.